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| Requirements Each cabling segment shall be installed such that odd numbered fibers are Position A at one end and Position B at the other end while the even numbered fibers are Position B at one end and Position A at the other end. The 568SC implementation shall be achieved by using consecutive fiber numbering (i.e., 1,2,3,4...) on both ends of an optical fiber link, but the 568SC adapters shall be installed in opposite manners on each end (i.e., A-B, A-B... on one end and B-A, B-A... on the other). Recommendations For other duplex connector styles (i.e., small form factor), polarity may be achieved either by using the above method for the 568SC or by using reverse-pair positioning. Reverse-pair positioning is achieved by installing fibers in consecutive fiber numbering (i.e., 1,2,3,4 ….) on one end of an optical fiber link and reverse-pair numbering (i.e., 2,1,4,3….) on the other end of the optical fiber link. Optical fiber links shall be installed to ensure that on one end, the 568SC or comparable adapter is installed in the A-B orientation and, on the other end, installed in the B-A orientation.
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